Resiliently mounted impeller blades



Sept. 23, 1958 c. A. FORTH, SR

RESILIENTLY MOUNTED IMPELLER BLADES Filed Jan. 3, 1956 rZ/L, 5r.

ATTORNEYS United States atent Ofifice 2,853,140 Patented Sept. 23, 1958 RESILIENTLY MOUNTED IlVIPELLER BLADES Claude A. Forth, Sr., Brookside Products acorporation Application January 3, 1956, Serial No. 556,915 7 Claims. (Cl. 170-16053) McCordsville, Ind., assignor to Company, Inc., McCordsville, Ind,

' described above which will restrain the members against radial movement with relation to a vibrationless hub.

A still further object of the invention is to provide a multi-bladed impeller of the class described above which will be inexpensive to manufacture, quiet in use, and simple to maintain.

Other objects and advantages will become apparent from the following specification when considered in the light of the attached drawings, in which:

Figure 1 is a front elevation of the impeller embodying the present invention with parts broken away.

Figure 2 is a side elevation of the invention.

Figure 3 is a fragmentary enlarged front elevation of the hub structure of the impeller.

Figure 4 is an enlarged detailed vertical cross-section taken along the line 4-4 of Figure 1, looking in the direction of the arrows.

Referring now to the drawings in detail wherein like reference numerals indicate like parts throughout the several figures, the reference numeral indicates generally a blade member comprising a central hub portion 11, and a plurality of equispaced radially extending blades 12, 13 and 14. The hub portion 11 is provided with a circular embossed groove 15 which is positioned axially of the hub 11 and has extending outwardly therefrom a radial groove 16 which is formed similarly to the circular groove 15 and extends into the blade 12. A radial groove 17 also communicates with the groove 15 and extends into the blade 13, while a groove 18 is similarly connected to the groove 15 and extends into the blade 14. I

Centrally positioned between each of the radial grooves 16, 17 and 18 are short grooves 19, 20 and 21, respectively, which communicate with the circular groove 15 and extend to the edge of the hub 11. The hub 11 of the blade member 10 is provided with a central bore 22, the purpose of which will be explained.

Each of the blades 12, 13 and 14 are provided with an outwardly projecting car 23 having an orifice 24 formed therein. A second blade carrying member, generally indicated at 25, is likewise provided with a hub 26 having a central bore 27 therein. A plurality of blades 28, 29 and 30 extend outwardly from the hub 26 in a radial direction and are provided at their outer edges with ears 31 having orifices 32 formed therein.

A circular groove 33 is formed axially of the hub 26 of the same size as the circular groove 15 and is formed so as to interfit the groove 15 when the blade carrying members 10 and are brought into overlying position as illustrated in Figure 4.

The blade 28 has a radial groove 34 extending radially inwardly thereon to communicate with the groove 33. The blade 29 has a radially extending groove 35 communicating with the groove 33, while the blade has a groove 36 formed therein to extend to the groove 33. Midway between the radial grooves 34, and 36, the hub 26 is provided with short grooves 37, 38 and 39 extending radially outwardly so as to align with the radial grooves 16, 17 and 18, respectively, on the blade carrying member 10. The short grooves 19, 20 and 21 on the hub 11 overlie the inner ends of the grooves 34, 35 and 36 on the blade carrying member 25 so as to interfit as illustrated in Figure 4. Obviously, the formation of the hubs 11 and 26 are such that no radial movement can occur between the blade carrying members 10 and 25.

A hub 40 having a bore 41 extending axially therethrough is provided with a shoulder 42 and a reduced portion 43 extending therefrom. An annular washer 44 is positioned adjacent the shoulder 42 and has a rubber mounting block 45 positioned thereagainst and against the reduced portion 43. A tubular extension 46 extends outwardly from the block 45 and forms a cylindrical mounting portion for the blade carrying members 10 and 25.

A resilient washer 47 is positioned against the outer face of the blade carrying members 10 and 25 over the tubular extension 46. A washer 48 is positioned against the outer face of the resilient washer 47 and is adapted to clamp the assembly together. The outer end of the hub 48 is swaged at 49 to engage the washer 48 holding the assembled blades onto the hub 40.

A ring 50 having a cylindrical flange 51 formed thereon is secured to each of the ears 23 and 31 by means of attaching elements 52. The ring 50 is discontinuous, having a gap at 53 between the ends thereof.

In the use and operation of the invention, the hub 40 is mounted to the shaft of a motor or to any power driven shaft desired with the blades 12, 13, 14, 28, 29 and 3-0 extending transversely of the air flow direction. The hubs 11 and 26 of the blade carrying members 10 and 25 are resiliently mounted on the rubber block 45 and are clamped thereon with the resilient washer 47 to provide a vibrationless mounting therefor. Obviously, the blades 12, 13, 14, 28, 29 and 30 are sloped or twisted about a radial center to produce an air impeller effect.

With the structure described above, it is obvious that the use of rivets and other positive fastening elements between the hubs 11 and 26 are completely eliminated along with their attendant failures.

Having thus described the preferred embodiment of the invention, it should be understood that numerous modifications and structural adaptations may be resorted to Without departing from the scope of the appended claims.

What is claimed is:

1. An impeller comprising a hub portion, a plurality of blades extending radially from said hub portion, a second hub portion, a plurality of blades extending radially from said second hub portion, means connecting the outer end edges of each of said blades, and interfitting radially and annularly embossed portions on said hub portions to hold said hub portions against radial and circumferential displacement with respect to each other.

2. A device as claimed in claim 8 wherein said means connecting the outer end edges of said blades comprises a discontinuous L-shaped ring and fastening elements securing each of said blades to said ring.

3. An impeller comprising a hub adapted to receive a drive shaft, a pair of confronting fan hub portions, means mounting said fan hub portions on said hub, interfitting radially and annularly embossed portions on said hub portions holding said hub portions against radial and circumferential displacement with respect to each other, a plurality of blades extending radially from each of said fan hub portions, a discontinuous ring of L-shaped cross section and means securing the outer end edge of each blade to said ring.

4. An impeller comprising a hub adapted to receive a drive shaft, said hub having a shoulder adjacent one end thereof and a reduced portion extending from said shoulder to said end of said hub, a Washer positioned on said reduced portion and engaging said shoulder, a hollow cylindrical resilient mounting block mounted on said reduced portion of said hub, a flange portion formed integrally on said resilient mounting block engaging against said washer, a pair of fan hub portions mounted on said mounting block, a resilient washer surrounding said mounting block, said fan hub portions being positioned between said resilient washer and said flange of said mounting block, means mounted on the end of said hub bearing against said resilient Washer and holding said fan hub portions together, a plurality of blades extending radially from each of said fan hub portions, each of said fan hub portions having interfitting radially and annularly embossed portions thereon to hold said fan hub portions against radial and circumferential displacement with respect to each other, and a discontinuous ring of L-shaped cross section, the outer edge of each of said blades being secured to said ring.

5. An impeller comprising a plurality of hub portions, a plurality of blades extending radially from each of said hub portions, means connecting the outer end edges of each of said blades and interfitting radially and annularly embossed portions on said hub portions to hold said hub portions against radial and circumferential displacement with respect to each other.

6. An impeller comprising a hub portion, a plurality of blades extending radially from said hub portion, a second hub portion, a plurality of blades extending radially from said second hub portion and interfitting radially and annularly embossed portions on said hub portions to hold said hub portions against radial and circumferential displacement with respect to each other.

7. An impeller gornprising a plurality of hub portions, a plurality o'f'blades extending radially from each of said hub portions, apd' interfitting radially and annularly embossed p'oftions; on said hub portions to hold said hub portions aga i 'n t radial and circumferential displacement with respect '-.to each other.

References Cited in the file of this patent 

